Do not perform privileged operations at runtime

Allow all user-owned directories to be bind-mounted by docker (so we
don't have to know which user we'll be running as at runtime).
3 jobs for master in 2 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #3751
build

00:01:44

 
  Docker Build
failed #3752
docker_build

00:00:39

 
  Release
skipped #3753
release
 
Name Stage Failure
failed
docker_build Docker Build There is an unknown failure, please try again
Enabling conf php7.0-fpm.
Conf other-vhosts-access-log disabled.
Conf serve-cgi-bin disabled.
Enabling site webmail.
To activate the new configuration, you need to run:
service apache2 reload
rm: cannot remove '/var/www/webmail/temp': Is a directory
The command '/bin/sh -c /tmp/build.sh && rm -fr /tmp/build.sh /tmp/conf' returned a non-zero code: 1
ERROR: Job failed: exit code 1